XML 22 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9

INVESTMENT ACTIVITY (Details)	12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended		0 Months Ended			0 Months Ended		12 Months Ended					12 Months Ended	3 Months Ended	12 Months Ended		0 Months Ended			12 Months Ended									0 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2014 USD ($) property	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2014 USIFB, LLP	Jun. 30, 2014 USIFB, LLP facility	Dec. 31, 2014 USIFB, LLP	Dec. 31, 2008 USIFB, LLP	Sep. 28, 2012 HSRE Venture USD ($)	Sep. 26, 2011 HSRE Venture property	Sep. 28, 2012 HSRE Venture	Nov. 03, 2014 HSRE USD ($) facility	Aug. 25, 2014 HSRE property	Dec. 31, 2014 HSRE USD ($)	Nov. 03, 2014 HSRE USD ($)	Aug. 25, 2014 HSRE USD ($)	Dec. 31, 2014 5 Old Lancaster Road located in Malvern, PA USD ($)	Dec. 31, 2014 Bronx, NY USD ($)	Dec. 31, 2014 Self-storage facilities located in New York and Virginia USD ($) facility	Dec. 31, 2014 Self-storage facilities located in New York USD ($) facility	Dec. 31, 2014 Self-storage facilities located in New York USD ($) facility	Dec. 31, 2014 Self-storage facility located in Virginia facility	Jun. 30, 2014 Asset in London, England USIFB, LLP USD ($) property	Jun. 30, 2014 Asset in London, England USIFB, LLP USD ($)	Jun. 30, 2014 Asset in London, England USIFB, LLP GBP (£)	Dec. 31, 2014 Real Estate Acquisition Expected by 2016 USD ($)	Dec. 31, 2014 Self-storage facilities USD ($) property	Dec. 31, 2013 Self-storage facilities USD ($) property	Dec. 31, 2012 Self-storage facilities USD ($) property	Dec. 31, 2014 Self-storage facilities 2014 Acquisitions USD ($) property	Dec. 31, 2014 Self-storage facilities 2013 Acquisitions USD ($)	Dec. 31, 2013 Self-storage facilities 2013 Acquisitions USD ($) property	Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions USD ($)	Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions USD ($) property	Sep. 28, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($) property	Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($)	Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($)	Sep. 28, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($)	Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets USD ($)	Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets USD ($) property facility
Self-storage facilities
Development costs																$ 25,100,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_Old5LancasterRoadMalvernPAMember	$ 17,200,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_BronxNYMember	$ 35,400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkAndVirginiaMember	$ 400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember	$ 400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember
Amount of Storage Deluxe transaction																																							560,000,000cube_AmountOfStorageDeluxeTransaction / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of self-storage facilities																		4cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkAndVirginiaMember	1cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember	3cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember	1cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilityInVirginiaMember																		22cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of self-storage facilities acquired (in properties)									9cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember			26cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember														53cube_NumberOfRealEstatePropertiesAcquired / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember			31cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		20cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		22cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	9cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember					6cube_NumberOfRealEstatePropertiesAcquired / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Aggregate purchase or sale price															223,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember								7,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember	4,100,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember		568,200,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	126,400,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	60,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	372,700,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		189,800,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		128,400,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember						201,900,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Intangible value of the in-place leases														14,500,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember															23,800,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		13,500,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		13,200,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember				8,300,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		12,300,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Estimated life											12 months																		12 months		12 months		12 months	12 months					12 months
Amortization expense													2,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember																13,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	8,200,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	5,300,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	8,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	4,800,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		6,200,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	2,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		4,400,000us-gaap_AmortizationOfIntangibleAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	7,900,000us-gaap_AmortizationOfIntangibleAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of properties, assumed mortgage																													4cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		1cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		2cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Assumed mortgage debt, at fair value																													27,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		8,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		13,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember						93,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Outstanding principal balance of mortgage debt assumed on acquisitions																													26,000,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		8,500,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		13,400,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember						88,900,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Premium on debt assumed on acquisitions																													1,500,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		400,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember		500,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember						4,200,000cube_RealEstatePropertiesPremiumOnDebtAssumed / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of facilities closed											22cube_NumberOfFacilitiesClosed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember
Aggregate purchase price of facilities closed											195,500,000cube_SignificantAcquisitionsAndDisposalsAggregatePurchasePriceOfClosedFacilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember
Number of facilities not yet closed											4cube_NumberOfFacilitiesNotYetClosed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember
Deposit													5,000,000us-gaap_DepositAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember												5,200,000us-gaap_DepositAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member
Number of facilities under contract																									4cube_NumberOfFacilitiesUnderContract / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member
Number of assets sold	1cube_NumberOfRealEstatePropertiesSold				1cube_NumberOfRealEstatePropertiesSold / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember																	1cube_NumberOfRealEstatePropertiesSold / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember					35cube_NumberOfRealEstatePropertiesSold / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	26cube_NumberOfRealEstatePropertiesSold / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Ownership interest held by the entity (as a percent)				97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember		97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember	97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember
Net proceeds from sale of assets																						7,000,000us-gaap_ProceedsFromSaleOfRealEstate / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember
Gain from sale of real estate	475,000us-gaap_GainLossOnSaleOfProperties																					500,000us-gaap_GainLossOnSaleOfProperties / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember					27,400,000us-gaap_GainLossOnSaleOfProperties / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	9,800,000us-gaap_GainLossOnSaleOfProperties / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Expected aggregate purchase or sales price																									85,200,000cube_SignificantAcquisitionsAndDisposalsExpectedAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member
Acquisition of remaining interest in real estate ventures (as a percent)										50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember																											50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Cash paid for acquisition of remaining interest in real estate ventures								21,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember																										21,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Repayments of debt								59,300,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember																										59,300,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Fair value of storage facilities																																					102,000,000us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Summary of the amounts of revenue and earnings of the 2014 and 2013 acquisitions since the acquisition dates
Total revenue	21,156,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	7,048,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	19,028,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Net loss	$ (12,350,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	$ (4,228,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	$ (11,464,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual

X

- Definition

Represents the transaction amount involving Class A self-storage facilities.

+ References

No definition available.

+ Details

Name:	cube_AmountOfStorageDeluxeTransaction
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	cube_BusinessAcquisitionProFormaInformationOfAcquireeSinceAcquisitionDateActualAbstract
Namespace Prefix:	cube_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of facilities closed.

+ References

No definition available.

+ Details

Name:	cube_NumberOfFacilitiesClosed
Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of facilities not yet closed.

+ References

No definition available.

+ Details

Name:	cube_NumberOfFacilitiesNotYetClosed
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of facilities under contract.

+ References

No definition available.

+ Details

Name:	cube_NumberOfFacilitiesUnderContract
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of real estate properties that were acquired.

+ References

No definition available.

+ Details

Name:	cube_NumberOfRealEstatePropertiesAcquired
Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of real estate acquired properties of which mortgages were assumed.

+ References

No definition available.

+ Details

Name:	cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed
Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of real estate properties that were sold.

+ References

No definition available.

+ Details

Name:	cube_NumberOfRealEstatePropertiesSold
Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of self-storage facilities involved in transaction.

+ References

No definition available.

+ Details

Name:	cube_NumberOfSelfStorageFacilities
Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the intangible lease assets recorded as part of the real estate acquisition.

+ References

No definition available.

+ Details

Name:	cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the debt assumed on real estate acquisition.

+ References

No definition available.

+ Details

Name:	cube_RealEstatePropertiesDebtAssumedOnAcquisition
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the premium on debt assumed on real estate acquisition.

+ References

No definition available.

+ Details

Name:	cube_RealEstatePropertiesPremiumOnDebtAssumed
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of aggregate purchase price of facilities closed.

+ References

No definition available.

+ Details

Name:	cube_SignificantAcquisitionsAndDisposalsAggregatePurchasePriceOfClosedFacilities
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The expected value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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X

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Period Type:	duration

X

- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

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X

- Definition

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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Period Type:	duration

X

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

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Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685

+ Details

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